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COVID infections are on the rise again, thanks to the latest sub-variant of Omicron. And if you think just because you've had COVID already you won't get it a second time, think again: even if you're vaccinated, your immunity only lasts a few months, and reinfection numbers are climbing. Today, epidemiologist Nancy Baxter on the health dangers associated with having COVID-19 more than once, and why we should all be doing everything to avoid it. Featured: Professor Nancy Baxter, epidemiologist and head of school, Melbourne School of Population and Global Health